Looking for a CAD program

Can anyone recommend a free or very low cost CAD program capable of making decent 2-D engineering drawings? I am interested in designing some telescope elements such as machined lens cells for refractors, focusers, and similar items. I have PC's and Mac's available.

I used LibreCAD (free) on Windows and Linux for rebuilding my 16" Dobsonian.
I never printed out any drawings, but tried out a lot of possibilities and pulled off dimensions for parts.
It was invaluable for

So DesignSpark Mechanical is now available for free d/l.I thought about trying it out but you need to register w/the website to d/l it, phone # and all.I decided not to get it cause it looks like a glorified storeplaced on your desktop wrapped in a free CAD program. It does, however,import/export a wide range of useful file formats.

Well I couldn't help my self. I d/l'ed the above ^^ program ^^.Looks great. I just installed it(used fake info for registration. Don't need to buy stuff from them.) and looked around. I can post pics if I get around to modeling something.

So I finally got around to messing with the tutorials in
DesignSpark Mechanical. Here is a pic a cube I made via the tut's .
So, yeah, I'm liking this CAD program. So far easy to learn
and I have only exp. in OpenScad which is very different.

If you have any educational connections, AutoCad will give you any full version that you want. These include full 2D and 3D capabilities. Printing with the educational versions is a bit more limited than with the commercial versions but not by much. Solidworks is my favorite for 3D (very pricey) but I really like AutoCad for 2D and you can't beat free for a price!John